How do you find the inverse of #f(x)=3x-5#?

2 Answers
Apr 17, 2018

#f(x)^-1 =1/3x+5/3#

Explanation:

#f(x)=3x-5#
The inverse of a function completely swaps the x and y values. One way to find the inverse of a function is to switch the "x" and "y" in a equation
#y=3x-5# turns into #x=3y-5#
Then solve the equation for y
#x=3y-5#
#x+5=3y#
#1/3x+5/3=y#
#f(x)^-1 =1/3x+5/3#

Apr 17, 2018

#f(x)=3x-5#

#y=3x-5#

#x=3y-5#

add three to both sides

#3y=x+5#

divide by #three# on both sides

#f^-1(x)#=#5/3# + #x/3#

#f^-1(x)#=#x+5# /#3#